Need advice on resetting valve lash during engine break in. - 460 Ford Forum
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post #1 of 4 (permalink) Old 05-17-2017, 12:12 PM Thread Starter
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Smile Need advice on resetting valve lash during engine break in.

So I used a set of cheap poly-lock retaining nuts and most of them loosened up during break in. I decided to buy new self locking nuts but now the engine has ran for about 10 minutes and I was wondering if it was alright be me to just tighten the nuts up enough so the rockers won't clatter and finsh the break in then leave the engine idle and set the preload or could I just lash the valves normally by tightening up the nuts enough that the push rod has some resistance then crank in preload? Any advice would be much appreciated. Thanks. (Edit) Seems this got posted more then once. Sorry about that guys.

Last edited by Wesley; 05-17-2017 at 12:24 PM.
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post #2 of 4 (permalink) Old 05-17-2017, 03:22 PM
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Is this the break-in of a new cam and lifters. Most recommend to adjust the lifters with the engine off, rotating by hand and watching the valve movement on the cylinder that you are about to adjust. Google "EOIC valve adjustment method".
For new cam and lifter break-in you should be using a special "break-in oil". Such as https://www.summitracing.com/search?...Break-in%20oil

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post #3 of 4 (permalink) Old 05-17-2017, 03:38 PM
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Quote:
Originally Posted by Wesley View Post
So I used a set of cheap poly-lock retaining nuts and most of them loosened up during break in. I decided to buy new self locking nuts but now the engine has ran for about 10 minutes and I was wondering if it was alright be me to just tighten the nuts up enough so the rockers won't clatter and finsh the break in then leave the engine idle and set the preload or could I just lash the valves normally by tightening up the nuts enough that the push rod has some resistance then crank in preload? Any advice would be much appreciated. Thanks. (Edit) Seems this got posted more then once. Sorry about that guys.
If the came loose you are doing it wrong

hyd or solid lifter cam?

self locking wont help if you are setting them wrong, the allen has to be pulled down into the stud to stay tight, YOU DONT TIGHTEN THE ALLEN(SET SCREW) AFTER THE HEX IS TIGHT.THIS IS A COMMON MISTAKE. You must tighten both at the same time

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post #4 of 4 (permalink) Old 05-17-2017, 04:28 PM Thread Starter
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It's a hydraulic flat tappet cam. And your probably right about me adjusting the poly-locks wrong, I was just wondering how I would go about readjusting valve lash now that the lifters have oil pressure.
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